If you don't have a great understanding of the spectrum as a whole....this image sums it up very well. I don't think any child can be neatly plotted on a chart such as this, but it gives a better understanding to what is meant by a diagnosis and the expectations (or lack thereof) that follow a particular diagnosis.
Anyway, Dr. James Coplan, who has written probably the newest very well written all inclusive handbook on ASD's now has a website/blog where he is sharing thoughts and other images such as this. As a very visual person, I am enjoying all of his articles and visual aids.
Check it out! http://www.psychologytoday.com/blog/making-sense-autistic-spectrum-disorders